I have had pain in the back of my right arm, slightly above the bicep, and below the shoulder. I attempted to throw a snowball last December, and it has been painful since. It hurts when I reach behind me, or quickly lift my right arm above my head. The pain lingers for several minutes, sort of like a cramp. It really does not feel like it is in the shoulder (ie. tear in the rotator cuff), but more like a muscle pull that won't go away.
It sounds like you may have a torn tendon, I had the same symptoms that went on for months until I finally went to a doctor and got and MRI, I had torn my extensor tendon half into, it takes months to get over this type of injury due to the fact that blood flow to tendons is so low.
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